Model updating of damped structures using SMURF technique

In this paper، a new FRF-based model updating method is proposed based on the Structural Modification Using experimental frequency Response Functions (SMURF) method. The method deals with the complex Frequency Response Functions (FRFs) and aims to update the lumped parameters of system. The parameters of FE model are updated accurately using only a limited data. A twelve Degrees Of Freedom system is considered as a test case in a simulated experiment. The convergence of the method and the accuracy with which it corrects the FE model are studied. Moreover، the effects of the number of modes، the frequency range of interest، the coordinate incompleteness and noise on the quality of the updated model are investigated. Finally a cantilever beam was used as experimental case study. The results show that the updated FRFs are in good agreement with their experimental counterparts.